Figure 25: Comparison of the time history of the increase in temperature projected by two related models developed at the National Center for Atmospheric Research for an emission scenario where the greenhouse gas concentrations are allowed to rise without restriction (baseline) and for a case (stabilization) where steps are taken to limit the rise in the CO2 concentration to 550 ppmv (Dai et al., 1999; Washington et al., 1999).
   

The following figures include the HadCM2 stabiliation experiment.  The HadCM2 'business as usual' and stabilization at 550 ppmv CO2 both are based on 1% per year greenhouse gas only (and therefore do not include the effects of sulfates).  Note that the  1% per year increase is also slightly larger than the NCAR greenhouse gas increases.